Microcrystalline Quartz

Tumbled brown chalcedony or jasper

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide impurities

Agate (Polished Nodule)

Agate (Silicon Dioxide, SiO2)

Jasper with Cinnabar (Dragon Blood Jasper variant)

Silicon Dioxide with Mercury Sulfide (SiO2 + HgS)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

White Agate / Chalcedony

Silicon Dioxide (SiO2)

Jasper (Banded Jasper / Chert)

Silicon Dioxide (SiO2 with iron oxide inclusions)

Carnelian

Chalcedony (Silicon Dioxide, SiO2)

Yellow Jasper

Tectosilicates (SiO2) with Goethite/Iron oxide inclusions

Jasper Pebble

Microcrystalline Quartz (SiO2)

Likely tumbled quartz/chalcedony pebble

Quartz (SiO₂), possibly microcrystalline chalcedony

Tumbled brown jasper

Microcrystalline quartz/chalcedony (SiO₂), commonly iron-stained

Tumbled orange jasper/quartzite pebble

Jasper, microcrystalline quartz (SiO₂), likely iron-oxide colored

Tumbled jasper (likely brecciated or red jasper)

Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions

Polished brown jasper

Jasper, microcrystalline quartz (SiO₂), commonly containing iron-oxide and clay inclusions

Iron-stained Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Banded Iron Formation (Jaspilite / Hematite Jasper)

SiO2 + Fe2O3 (Quartz with Hematite/Magnetite)

Jasper or Carnelian (Chalcedony)

Cryptocrystalline quartz (SiO2) with iron oxide impurities

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Red Jasper

SiO2 (Microcrystalline Quartz)

Breciated Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Brown stone, likely a weathered chert or iron-stained rock

Unidentified brown lithic specimen; composition cannot be determined from the image

Small brown jasper or chert fragment

Microcrystalline quartz (SiO₂), likely iron-stained jasper/chert

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Botryoidal Chalcedony / Agate

Silicon Dioxide (SiO2)

Red Jasper (or Ironstone/Jasper Conglomerate)

Microcrystalline Quartz with Hematite inclusions (SiO2 + Fe2O3)

Banded Agate (Onyx type)

Silicon Dioxide (SiO2)

Jasper (Cream/Yellow variety)

Silicon dioxide (SiO2)

Agate slice

Chalcedony (SiO2)

Red Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

Chalcedony Nodule (Carnelian/Agate)

Chalcedony (Silicon Dioxide, SiO2)

Polished brown chert or jasper pebble

Microcrystalline quartz (SiO₂), likely chert/jasper with iron-oxide staining

Polished agate (likely carnelian or orange chalcedony)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloring

Tumbled brown stone, likely jasper or iron-rich chert

Microcrystalline quartz (SiO₂), possibly iron-oxide-bearing jasper/chert

Banded Agate (specifically Carnelian Agate)

Cryptocrystalline Quartz (SiO2)

Agate Geode

Silicon Dioxide (Quartz), SiO2

Chalcedony Agate Geode / Nodule

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Carnelian

Quartz (Silicon Dioxide, SiO2)

Black Obsidian

Volcanic Glass (predominantly SiO2, Silicon Dioxide)

Jasper

Jasper (Silicon Dioxide, SiO2)

Flint / Chert Pebble

Microcrystalline Quartz (SiO2)

Banded Chert Arrowhead (Projectile Point)

Microcrystalline Quartz (SiO2)